JP3586355B2 - Raw fuel loading apparatus and method for vertical furnace - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus and a method for charging raw fuel for a vertical furnace used for charging raw fuel into a vertical furnace such as a blast furnace, a cupola furnace, and a melting furnace.
[0002]
[Prior art]
Conventionally, as a raw fuel charging apparatus for a vertical furnace, there is a raw fuel charging apparatus B for a vertical furnace which the present applicant has previously presented in Japanese Utility Model Publication No. 57-18427, and the structure thereof is schematically shown in FIG. Show.
As shown in the figure, the base of a horizontal link 52 whose tip extends toward the center of the vertical furnace 50 is pivotally connected to the inner surface of the steel shell 51 of the vertical furnace 50. A base of a vertical link 53 whose tip extends downward is pivotally connected to the portion, and a link mechanism 54 is formed. An armor plate (or repulsion plate) 55 is attached to the front surface of the tip of the vertical link 53. The lower end of the vertical link 53 is pivotally connected to the tip of a horizontal push rod 56, while the base of the horizontal push rod 56 is attached to the outer surface of the steel shell 51 of the vertical furnace 50. It is pivotally connected to the telescopic rod of the cylinder 57. In FIG. 5, reference numeral 58 denotes a furnace body, 59 denotes a raw material, 60 denotes a bell that can be raised and lowered, 61 denotes a funnel portion, and 62 denotes a raw material deposition portion.
With the above-described configuration, when the operating cylinder 57 is operated to advance the horizontal push rod 56, as shown in FIG. 5, the repulsion plate 55 which has been in the vertical state is inclined inward at a steep angle as shown by the dotted line. Will be. Therefore, when the bell 60 is lowered, the raw material 59 falls radially from the gap between the funnel portion 61 and the bell 60 while sliding on the inclined surface outwardly, comes into contact with the repulsion plate 55, and then changes the falling direction. After being changed to the inside of the vertical furnace 50, it falls while drawing radiation toward the center of the furnace body 58.
[0003]
[Problems to be solved by the invention]
However, the above-described raw fuel charging apparatus B for a vertical furnace still has the following problems to be solved.
That is, since the raw material 59 is reflected by the repulsion plate 55, when the raw material 59 lands on the already-stored raw material deposition section 62, the raw material has not only a vertical force component but also a horizontal force component. Inflow occurs, and it is difficult to deposit accurately at a predetermined position.
In particular, in the method of charging raw fuel such as dust agglomerate, self-reducing ore, iron scrap, and solid fuel into a vertical furnace, which the present applicant has previously proposed in Japanese Patent Application No. 8-31178. It is necessary to precisely fill the center and periphery of the body with different types of raw materials and fuels, but with the above-described raw material charging apparatus B for a vertical furnace, such accurate filling becomes impossible. .
The present invention has been made in view of the above circumstances, and by loading a raw fuel into a vertical furnace without applying a horizontal force to the raw fuel, a plurality of raw fuels having different brands are accurately loaded at predetermined positions of the furnace body. It is an object of the present invention to provide an apparatus and a method for charging raw fuel of a vertical furnace which can be charged.
[0004]
[Means for Solving the Problems]
The raw fuel charging apparatus of the vertical furnace according to claim 1, wherein along the object, the lower end of the reservoir hopper top and bottom ends provided vertically movably above the furnace top BuSo inlet of the shaft furnace is made of a straight cylinder which is open A bell made of a conical body that can be moved toward and away from the opening and that can be moved up and down, and is horizontally movable and divided into two or more parts symmetrically in the radial direction about the furnace body axis of the vertical furnace A raw fuel guide member having a tapered lower portion and a discharge port at the bottom, and selectively charging raw fuel supplied from the storage hopper into a central portion in the furnace and a peripheral portion thereof. the switching guide device is provided on the furnace top portion of the shaft furnace.
Claim 2 raw fuel charging apparatus of the vertical furnace according, in raw fuel charging apparatus of the vertical furnace according to claim 1, wherein the diameter of the lower end of the bell, raw fuel charging of the furnace central portion The diameter of the outlet of the raw fuel guide member is set to be equal to or larger than the diameter of the raw fuel charging range in the central part of the furnace.
The raw fuel charging apparatus for a vertical furnace according to claim 3 is the raw fuel charging apparatus for a vertical furnace according to claim 1 or 2 , wherein the lower end of the bell and / or the outlet of the raw fuel guide member. Is provided with a straight cylindrical portion at the lower end.
[0005]
A raw fuel charging method for a vertical furnace according to a fourth aspect of the present invention uses the raw fuel charging apparatus according to any one of the first to third aspects , wherein the raw fuel charging apparatus is provided above the furnace top charging inlet of the vertical furnace. in the raw fuel from the reservoir hopper, the furnace central portion and the raw fuel charging method of the vertical furnace for selectively charged into the peripheral portion of the raw fuel provided, charging of the furnace central portion Is moved in the radial direction with respect to the furnace body axis and united the divided raw fuel guide member, forming a cylindrical raw fuel guide member having a tapered lower portion at the lower portion, and at the furnace top charging inlet After mounting, the raw fuel is supplied to the storage hopper, and the storage hopper and the bell provided at the lower end opening of the storage hopper are lowered to lower the lower end opening of the storage hopper into the cylindrical raw fuel guide. After placing on the top of the member, only the bell is lowered to remove the raw fuel. The raw fuel flows down through the cylindrical raw fuel guide member and is charged into the central part of the furnace. The peripheral part of the furnace is charged at the standby position after supplying the raw fuel to the storage hopper. The storage hopper and a bell provided at the lower end opening of the storage hopper are integrally lowered between the divided raw fuel guide members, and the storage hopper is mounted on the furnace top of the vertical furnace. After being placed at the entrance, only the bell is lowered to radially cut out the raw fuel, and the raw fuel is charged into the peripheral part in the furnace.
According to a fifth aspect of the present invention, there is provided a method for charging raw fuel in a vertical furnace according to the fourth aspect, wherein the first raw fuel having a high fuel rate (for example, A mixture of a raw material and an iron source having a low metallization ratio (M.Fe / T.Fe) or a carbon material) is charged, and a second raw fuel having a high iron source ratio (for example, An iron source having a high ratio (M.Fe / T.Fe) and a carbon material for carburizing) are charged.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.
First, an overall configuration of a raw fuel charging apparatus A for a vertical furnace according to an embodiment of the present invention will be described with reference to FIGS.
As shown in the figure, a raw material charging device A for a vertical furnace is provided on an upper part of a furnace body 11 of a vertical furnace 10 and substantially has a furnace body 11 whose outer surface is covered with a steel shell (not shown). A cylindrical gas recovery hood 12 connected to the top, a cylindrical portion 14 disposed concentrically and in a fixed state within the gas recovery hood 12, and a vertically movable member disposed above the cylindrical portion 14. Hopper 15, a bell 16 attached as an open / close valve at a lower end opening 33 forming an outlet of the storage hopper 15, and an axis XX of the furnace body 11 disposed above the gas recovery hood 12. A raw fuel guide member 19 composed of left and right halves 17 and 18 (each of which is an example of a raw fuel guide member) movable symmetrically in the radial direction with the center as the center. Constitutes the furnace top inlet.
[0007]
Next, the configuration of each part of the raw fuel charging apparatus A for a vertical furnace having the above-described configuration will be specifically described with reference to FIGS.
As shown in the figure, the central body 20 of the cylindrical gas recovery hood 12 having a circular cross section has a larger diameter than its upper and lower ends 21 and 22, and the lower end 22 has a furnace body 11 of the vertical furnace 10. Are connected to the upper end 23 of the airtight container in an airtight state. The upper end 23 of the furnace body 11 has substantially the same diameter as the lower end 22 of the gas recovery hood 12. A gas outlet 24 is provided at one of the central body portions 20 of the gas recovery hood 12, and a gas recovery duct 25 is connected to the gas outlet 24 via a flange.
[0008]
Inside the gas recovery hood 12, a cylindrical portion 14 having a diameter substantially equal to the upper and lower ends 21, 22 of the gas recovery hood 12 is concentrically arranged in a fixed state. That is, the upper end opening 26 of the cylindrical portion 14 is connected to the upper end 21 of the gas recovery hood 12, and the lower end opening 27 extends toward the upper end 23 of the furnace body 11. An annular gas outflow passage 28 is formed between the lower end opening 27 of the cylindrical portion 14 and the upper end 23 of the furnace body 11.
The central drop space 30 has a discharge port 13 of the raw fuel guide member 19 when the left and right halves 17, 18 disposed immediately above the cylindrical portion 14 are united, as an upper end. The peripheral falling space 31 is located at the periphery of the central falling space 30 while being aligned upward.
[0009]
As shown in FIGS. 1 to 3, a storage hopper 15 composed of a straight cylinder having upper and lower ends opened is disposed directly above the cylindrical portion 14 so as to be able to move up and down.
As shown in FIGS. 1 to 4, a bell 16 made of a cone is attached to the lower end opening 33 of the storage hopper 15 so as to be able to freely contact and separate. The bottom of the bell 16 has substantially the same area as the outlet 13 of the raw fuel guide member 19 formed when the left and right halves 17, 18 are combined.
As shown in FIG. 2, when the first raw fuel a falls from the storage hopper 15 located at the lower charging position to the periphery of the furnace body 11 through the peripheral fall space 31, the bell 16 is moved to the storage hopper 15. Is located in the cylindrical portion 14 at a position slightly lower than the lower end opening 33 of the storage hopper 15, and the lower end opening 33 of the storage hopper 15 is open.
On the other hand, as shown in FIG. 3, when the second raw fuel b falls from the storage hopper 15 at the upper charging position to the central portion of the furnace body 11 through the central falling space 30, the bell 16 becomes the storage hopper 15 Together with the raw fuel guide member 19.
The switching guide device described above is configured to have the bell 16 moving up and down and the raw fuel guide member 19 divided into right and left, and the raw fuels b and a supplied from the storage hopper 15 are transferred to the central part in the furnace and the central part thereof. It is selectively injected into the surrounding area.
[0010]
The storage hopper 15 is located in the raw fuel guide member 19 together with the bell 16 in the state shown in FIG. Further, by separating the bell 16 downward from the lower end opening 33 of the storage hopper 15 at this upper charging position, as shown in FIG. Between the surface 34, a radial cutout 35 is formed. It should be noted that the above-described ascent / descent operation of the bell 16 and the storage hopper 15 and the relative lowering operation of the bell 16 with respect to the storage hopper 15 are performed by using the upper end of a rod 36 erected on the top of the bell 16 as illustrated. It can be easily carried out by using a crane or the like that does not lift and hang up and down freely. As shown in FIGS. 1 to 4, a mounting bracket 37 is provided on a lower outer peripheral surface of the storage hopper 15, and the storage hopper 15 is in a state shown in FIG. In the state shown in FIG. 3, the gas recovery hood 12 is placed and supported on the upper end portion 21 of the gas recovery hood 12, and is supported on the raw fuel guide member 19.
[0011]
As shown in FIGS. 1 to 3, a raw fuel guide member 19 that can be opened and closed in the radial direction is disposed above the gas recovery hood 12. That is, the raw fuel guide member 19 is composed of left and right halves 17 and 18 which are horizontally movable symmetrically in the radial direction with respect to the axis XX of the furnace body 11, and the lower part is tapered and reduced in diameter. ing. Although various types of devices for moving the left and right half bodies 17 and 18 can be considered, for example, a pair of traveling carts on a floor having substantially the same height as the upper end 21 of the gas recovery hood 12 is provided. It is conceivable to mount the furnace body 11 left and right symmetrically about the axis XX of the furnace body 11 movably, and to mount the left and right half bodies 17 and 18 on these traveling vehicles.
These left and right halves 17, 18 are located at the left and right standby positions when the storage hopper 15 is at the lower loading position, as shown in FIG. On the other hand, as shown in FIG. 3, when the storage hopper 15 is at the upper charging position, that is, when the bell 16 and the storage hopper 15 are at the upper position and the central drop space 30 is secured, the left and right half The split bodies 17 and 18 are combined to form the raw fuel guide member 19. At this time, the raw fuel guide member 19 surrounds a lower part of the storage hopper 15 and has a lower inner surface on which a second raw fuel b cut out from the storage hopper 15 flows down into the central falling space 30. The falling slope 38 is formed.
The diameter of the lower end of the bell 16 is set to be equal to or larger than the diameter of the raw fuel charging range in the central part of the furnace, and the diameter of the outlet 13 of the raw fuel guide member 19 is set to the diameter of the raw fuel charging range in the central part of the furnace. It is preferable to set it within. Further, in the present embodiment, the raw fuel guide member 19 has a two-part structure, but may have a three-part structure or a more- part structure.
[0012]
Next, the charging operation of the raw material of the furnace body 11 of the vertical furnace 10 by the raw fuel charging apparatus A for a vertical furnace having the above-described configuration will be described. In the present embodiment, the first raw fuel a (for example, coke and dust agglomerate) having a high fuel rate is placed at the peripheral portion inside the furnace body 11 of the vertical furnace 10, and the iron source rate is placed at the central portion. In this case, a high second raw fuel b (for example, scrap) is charged.
First, a case in which the switching guide device is set to peripheral charging and the first raw fuel a is charged into the peripheral portion in the furnace body 11 will be described with reference to FIG.
The bell 16 and the storage hopper 15 are integrally lowered using a crane or the like between the left and right halves 17 and 18 of the raw fuel guide member 19 at the left and right standby positions, and the storage hopper 15 is placed. It is placed on the upper end 21 of the gas recovery hood 12 via the bracket 37. Further, only the bell 16 is lowered by using a crane or the like, and the central falling space 30 is closed by the bell 16. Form.
Thereby, the first raw fuel a stored in the storage hopper 15 flows down radially along the raw fuel sliding surface 34 and flows into the peripheral falling space 31. After that, the first raw fuel a is subjected to rectification by the bell lower end straight cylindrical portion 29 and the inner peripheral surface of the cylindrical portion 14 in the peripheral falling space 31. Accordingly, the first raw fuel a falls vertically to the peripheral portion in the furnace body 11 with the horizontal component disappeared. As described above, the first raw fuel a can be reliably prevented from being scattered in the horizontal direction, so that the first raw fuel a can be accurately and reliably deposited on the peripheral portion in the furnace body 11.
[0013]
Next, a case where the switching guide device is set to the central charging and the second raw fuel b is charged into the central portion of the furnace body 11 will be described with reference to FIG.
As shown in the figure, the left and right half bodies 17 and 18 are moved in the radial direction with respect to the axis XX of the furnace body 11 to be combined therewith to form a tubular raw fuel guide member 19, and the furnace top mounting part is formed. After being mounted at the entrance, the storage hopper 15 and the bell 16 are lowered using a crane or the like, and the storage hopper 15 is mounted on the upper surface of the raw fuel guide member 19 via the mounting bracket 37.
Thus, the lower part of the storage hopper 15 and the bell 16 are surrounded by the raw fuel guide member 19. Next, only the bell 16 is lowered using a crane or the like to form a radial cutout 35 between the lower end opening 33 of the storage hopper 15 and the raw fuel sliding surface 34 of the bell 16. The second raw fuel b that has been flowed down radially along the raw fuel sliding surface 34 and abuts against the raw fuel flowing down slope 38 of the raw fuel guide member 19, The raw fuel flows downward along the axis XX of the furnace body 11, and is subjected to a rectifying action at the straight cylindrical portion 32 at the lower end of the raw fuel guide member 19. Accordingly, the second raw fuel b also falls vertically to the central part of the furnace body 11, that is, the central part in the furnace, in a state where the horizontal component has disappeared. In this manner, the second raw fuel b can be reliably prevented from being scattered in the horizontal direction, so that the second raw fuel b can be accurately and reliably deposited on the central portion of the furnace body 11.
As described above, in the present embodiment, a plurality of raw fuels a and b having different contents can be accurately and reliably charged into a predetermined position in the furnace body 11.
[0014]
In particular, in the present embodiment, the cylindrical portion 14 is arranged concentrically and in a fixed state in the gas recovery hood 12 connected to the top of the furnace body 11, and the storage hopper 15 is raised and lowered above the cylindrical portion 14. A bell 16 having a raw fuel sliding surface 34 that is freely disposed and has a raw fuel sliding surface 34 that allows the first raw fuel a to flow down to the peripheral falling space 31 is attached to the lower end opening 33 of the storage hopper 15 so as to be vertically movable. Above the gas recovery hood 12, a raw fuel guide member 19 composed of left and right halves 17, 18 that is movable symmetrically in the radial direction about the axis XX of the furnace body 11 is provided. The raw fuel guide member 19 is provided with a raw fuel falling slope 38 for flowing the second raw fuel b toward the central falling space 30 on the lower inner surface of the raw fuel guide member 19.
Therefore, the first and second raw fuels a and b supplied into the storage hopper 15 fall almost linearly from the storage hopper 15 toward the peripheral part and the central part in the furnace body 11, respectively. Therefore, the shelving phenomenon can be prevented, and the charging operation of the raw fuels a and b can be performed accurately, reliably, and smoothly.
As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and is described in the claims. Other embodiments and modifications that can be considered within the scope of the present invention are also included.
[0015]
【The invention's effect】
In the apparatus for charging raw fuel for a vertical furnace according to claims 1 to 3 and the method for charging raw fuel for a vertical furnace according to claims 4 and 5 , the raw fuel supplied from a storage hopper is placed in a central part of the furnace. A switching guide device for selectively charging the periphery of the furnace is provided at the furnace top of the vertical furnace, so that the supply of raw fuel for the vertical furnace can be accurately distinguished between the central part and the periphery. it can.
Therefore, a plurality of raw fuels supplied into the storage hopper can be almost linearly dropped from the storage hopper toward a predetermined position in the furnace, respectively, so that a shelving phenomenon can be prevented. The charging operation can be performed accurately, reliably and smoothly.
Further, a switching guide device is provided detachably between a bell provided at the lower end opening of the storage hopper so as to be able to move up and down, and a storage hopper and a furnace top inlet, and the lower portion is tapered at the lower portion to reduce the diameter of the bottom portion. And a cylindrical raw fuel guide member having a discharge port, so that the storage hopper with a bell that goes up and down can be used as it is, and when the raw fuel guide member is used and not used, the central part of the furnace And the surroundings can be easily switched to the input position.
Further, the raw fuel guide member has a structure that can be vertically divided into a plurality of sections, and the divided raw fuel guide member moves horizontally and is detachably attached to the furnace top charging port. Can be easily mounted on the furnace top, and the apparatus can be simplified.
In the raw fuel charging apparatus for a vertical furnace according to claim 2, the diameter of the lower end of the bell is set to be equal to or larger than the diameter of the raw fuel charging range in the central part of the furnace, and the diameter of the outlet of the raw fuel guide member is Since the diameter of the raw fuel is not more than the diameter of the raw fuel charging range in the central part of the furnace, the falling position of the raw fuel to be charged can be accurately controlled.
[0016]
In the raw fuel charging apparatus for a vertical furnace according to the third aspect, by providing a straight cylindrical portion at the lower end of the bell and / or the lower end of the discharge port of the raw fuel guide member, the falling of the raw fuel can be stabilized. In addition, it is possible to prevent premature wear of the lower end of the bell and / or the outlet of the raw fuel guide member.
Furthermore, in particular, in the raw fuel charging method for a vertical furnace according to the fifth aspect, the first raw fuel having a high fuel rate from the storage hopper is accurately charged into the periphery of the furnace by using the switching guide device. In addition, the second raw fuel having a high iron source rate can be accurately injected into the central part of the furnace. Thereby, the stable operation of the vertical furnace can be performed.
Since the first raw fuel is radially cut out through the bell provided at the lower end opening of the storage hopper, the first raw fuel is uniformly injected into the furnace inner peripheral portion, and furthermore, the second raw fuel is radially injected from the bell. Since the fuel is collected at the center via the raw fuel guide member for reducing the diameter of the fuel and injected into the furnace, the second raw fuel is intensively injected into the center of the furnace. In this case, the input position of the raw fuel is determined depending on whether or not the raw fuel guide member is used.
And, the raw fuel guide members are vertically divided in advance, and they are horizontally moved and assembled at a predetermined position, so that the raw fuel guide members can be operated with the storage hopper arranged at the predetermined position, The control is simplified.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of the entire configuration of a raw fuel charging apparatus for a vertical furnace according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram of the entire configuration of a raw fuel charging apparatus for a vertical furnace when charging a first raw fuel according to an embodiment of the present invention.
FIG. 3 is an explanatory view of the entire configuration of a raw fuel charging apparatus for a vertical furnace when charging a second raw fuel according to an embodiment of the present invention.
FIG. 4 is an enlarged front view of a storage hopper and a bell.
FIG. 5 is an enlarged explanatory view of a main part configuration of a conventional raw fuel charging apparatus for a vertical furnace.
[Explanation of symbols]
Reference Signs List A Raw fuel charging device for vertical furnace a First raw fuel b Second raw fuel 10 Vertical furnace 11 Furnace body 12 Gas recovery hood 13 Discharge port 14 Cylindrical part 15 Storage hopper 16 Bell 17 Left half body 18 Right half 19 Raw fuel guide member 20 Center trunk 21 Upper end 22 Lower end 23 Upper end 24 Gas outlet 25 Gas recovery duct 26 Upper end opening 27 Lower end opening 28 Gas outflow passage 29 Bell lower straight part 30 Center drop Space 31 Peripheral falling space 32 Straight cylindrical part 33 Lower end opening 34 Raw fuel sliding surface 35 Radial cutout 36 Rod 37 Mounting bracket 38 Raw fuel flowing down slope

Claims (5)

A bell upward vertically movable upper and lower end arranged in the furnace top BuSo inlet of the shaft furnace is made of detachably and vertically movably provided cones at the lower end opening of the storage hopper comprising a right circular cylinder which is open, A raw fuel guide which is horizontally movable and is divided into two or three parts symmetrically in the radial direction with respect to the furnace body axis of the vertical furnace, and the lower part is tapered so as to have a discharge port at the bottom. and a member, the selectively switched to charging guide device raw fuel is introduced from the reservoir hopper and its periphery furnace central portion, characterized in that provided at the furnace top portion of the shaft furnace Raw fuel loading equipment for vertical furnaces. The diameter of the lower end of the bell is not less than the diameter of the raw fuel charging range in the central part of the furnace, and the diameter of the outlet of the raw fuel guide member is within the diameter of the raw fuel charging range in the central part of the furnace. The raw fuel charging apparatus for a vertical furnace according to claim 1, wherein: The raw fuel charging device for a vertical furnace according to claim 1 or 2 , wherein a straight tube portion is provided at a lower end of the bell and / or a lower end of an outlet of the raw fuel guide member. With raw fuel charging device according to any one of claims 1 to 3, the raw fuel from the reservoir hopper of the raw fuel provided above the furnace top BuSo inlet of the shaft furnace, the furnace In the raw fuel charging method for a vertical furnace in which a central part and a peripheral part thereof are selectively charged, the charging of the central part in the furnace may be such that the divided raw fuel guide member has a radius relative to a furnace body axis. Forming a cylindrical raw fuel guide member having a tapered lower portion at its lower portion, and attaching the raw fuel to the furnace top charging inlet, and then supplying the raw fuel to the storage hopper; And the bell provided at the lower end opening of the storage hopper is lowered, and the lower end opening of the storage hopper is placed on the upper part of the cylindrical raw fuel guide member. The fuel is cut out and allowed to flow down in the cylindrical raw fuel guide member. After charging the raw fuel to the storage hopper, the raw fuel is charged into the central part in the furnace, and the raw fuel is supplied to the storage hopper. After the storage hopper and the bell provided at the lower end opening of the storage hopper are integrally lowered, and the storage hopper is placed at the furnace top charging port of the vertical furnace, only the bell is lowered to lower the original material. A method of charging raw fuel for a vertical furnace, wherein fuel is radially cut out and charged in a peripheral portion of the furnace. The method according to claim 4, wherein a first raw fuel having a high fuel rate is charged into a peripheral portion of the furnace, and a second raw fuel having a high iron source rate is charged into a central portion of the furnace. How to load raw fuel for vertical furnace.

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